Hole Enlarging Drill Bits.Usage Scenarios:1.Suitable for holing, cutting on wood, soft metal, aluminum plate, iron, etc.2.suitable for drilling and cut grooving processing on thin wood plate, wood, aluminum, and plastic boards.Item Type:Drill BitsMaterial:High-Speed Steel+Titanium CoatedStructure: &DrillApplicationWoodworking, Aluminum Alloy, Plastic Board Drilling And Cut GroovingProduct specifications:3mm, 4mm, 5mm, 6mm, 6.5mm, 8mmThis is a 3 in 1 serrated drill:Function 1: Can be used as a drillFunction 2: Can be used as a sawtooth grooveFunction 3: Can be used as a blade on the surface of woodPackage list for you to choose:3mm(1PC)4mm(1PC)5mm(1PC)6mm(1PC)6.5mm(1PC)8mm(1PC)3-8mm(6PCS)